The aim of operation Rheinübung was to have a German surface fleet, not Bismark, Prinz Eugen and Tirpitz in this case sail to Brest. I have conducted an in-depth analysis of how this would take place, got a word document with 9000 words in it. (I got to develop my thought on that one.) Overall the Nazi's had their ass stuck up their own backside regarding 'everything'. Pre-logistical preparation, preventing the bombing of German ports and what operation Rheinübung's overall aim. One battleship stuck in the middle of the Atlantic Ocean is one way to get a target destroyed, battleships were not used this way anymore because U-boats, aeroplanes and aircraft carriers had advanced so much since WW1. The only real nation who used their fleet correctly in WW2 were the Americans.
However even though they used their fleet disgracefully, I glad they did because a German surface fleet in the Atlantic, if used correctly, would have won Hitler the war.